As clichéd as this might sound, The beatles are in my opinion the greatest musical group of all time. Their song writing skills were of such high quality that no one since them has come close to matching their brilliance.
A day in the life, Strawberry fields forever, In my life, Norwegian wood, Rain, She said she said, All across the universe, Please please me, Day tripper , I feel fine, While my guitar gently weeps, Hey Jude, I am the Walrus, Girl etc etc etc The amount of classic songs they wrote seem endless.
And apart from those guys, My other favourite bands would be Nirvana, Jimi Hendrix, The strokes, Early Coldplay ( first 3 albums ) The pixies, The red hot chilli peppers ( The californication album especially )
There's so much great music out there, But at the same time there's not enough NEW great music being made. U